The undated file photo distributed by the Mexican government shows Rafael Caro Quintero, considered the grandfather of Mexican drug trafficking. (AP Photo/File) by Adriana Gomez LoconAssociated Press Writer MEXICO CITY (AP) — U.S. law enforcement officials expressed outrage over the release from prison of Mexican drug lord Rafael Caro Quintero and vowed to continue efforts to bring to justice the man who ordered the killing of a U.S. Drug Enforcement Administration agent.